<?php

/**
 * A handler to provide proper displays for dates.
 *
 * @ingroup views_field_handlers
 */
class views_handler_field_date extends views_handler_field {

    function option_definition() {
        $options = parent::option_definition();

        $options['date_format'] = array('default' => 'small');
        $options['custom_date_format'] = array('default' => '');

        return $options;
    }

    function options_form(&$form, &$form_state) {
        parent::options_form($form, $form_state);
        $time = time();

        $form['date_format'] = array(
            '#type' => 'select',
            '#title' => t('Date format'),
            '#options' => array(
                'small' => t('Short date format') . ' ' . format_date($time, 'small'),
                'medium' => t('Medium date format') . ' ' . format_date($time, 'medium'),
                'large' => t('Long date format') . ' ' . format_date($time, 'large'),
                'custom' => t('Custom'),
                'raw time ago' => t('Time ago'),
                'time ago' => t('Time ago (with "ago" appended)'),
                'raw time span' => t('Time span (future dates start with - )'),
                'time span' => t('Time span (with "ago/hence" appended)'),
            ),
            '#default_value' => isset($this->options['date_format']) ? $this->options['date_format'] : 'small',
        );
        $form['custom_date_format'] = array(
            '#type' => 'textfield',
            '#title' => t('Custom date format'),
            '#description' => t('If "Custom", see <a href="http://us.php.net/manual/en/function.date.php" target="_blank">the PHP docs</a> for date formats. If "Time ago", enter the number of different time units to display, which defaults to 2.'),
            '#default_value' => isset($this->options['custom_date_format']) ? $this->options['custom_date_format'] : '',
            '#process' => array('views_process_dependency'),
            '#dependency' => array('edit-options-date-format' => array('custom', 'raw time ago', 'time ago', 'raw time span', 'time span')),
        );
    }

    function render($values) {
        $value = $values->{$this->field_alias};
        $format = $this->options['date_format'];
        if (in_array($format, array('custom', 'raw time ago', 'time ago', 'raw time span', 'time span'))) {
            $custom_format = $this->options['custom_date_format'];
        }

        if ($value) {
            $time_diff = time() - $value; // will be positive for a datetime in the past (ago), and negative for a datetime in the future (hence)
            switch ($format) {
                case 'raw time ago':
                    return format_interval($time_diff, is_numeric($custom_format) ? $custom_format : 2);
                case 'time ago':
                    return t('%time ago', array('%time' => format_interval($time_diff, is_numeric($custom_format) ? $custom_format : 2)));
                case 'raw time span':
                    return ($time_diff < 0 ? '-' : '') . format_interval(abs($time_diff), is_numeric($custom_format) ? $custom_format : 2);
                case 'time span':
                    return t(($time_diff < 0 ? '%time hence' : '%time ago'), array('%time' => format_interval(abs($time_diff), is_numeric($custom_format) ? $custom_format : 2)));
                case 'custom':
                    if ($custom_format == 'r') {
                        return format_date($value, $format, $custom_format, null, 'en');
                    }
                    return format_date($value, $format, $custom_format);
                default:
                    return format_date($value, $format);
            }
        }
    }

}
